用java写一个有关职工工作的添加，查询，显示，编辑，删除，统计，保存，读取功能的程序

以下是一个简单的职工管理系统的Java程序，包括添加、查询、显示、编辑、删除、统计、保存和读取职工信息的功能：

import java.util.ArrayList;
import java.util.Scanner;
import java.io.*;

public class EmployeeManagementSystem {
    private static ArrayList<Employee> employees = new ArrayList<Employee>();

    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        boolean exit = false;
        while (!exit) {
            System.out.println("1. 添加职工信息");
            System.out.println("2. 查询职工信息");
            System.out.println("3. 显示所有职工信息");
            System.out.println("4. 编辑职工信息");
            System.out.println("5. 删除职工信息");
            System.out.println("6. 统计职工信息");
            System.out.println("7. 保存职工信息到文件");
            System.out.println("8. 从文件中读取职工信息");
            System.out.println("0. 退出");
            System.out.print("请选择操作：");
            int choice = input.nextInt();
            switch (choice) {
                case 1:
                    addEmployee();
                    break;
                case 2:
                    searchEmployee();
                    break;
                case 3:
                    displayEmployees();
                    break;
                case 4:
                    editEmployee();
                    break;
                case 5:
                    deleteEmployee();
                    break;
                case 6:
                    statistics();
                    break;
                case 7:
                    saveToFile();
                    break;
                case 8:
                    readFromFile();
                    break;
                case 0:
                    exit = true;
                    break;
                default:
                    System.out.println("无效的选择，请重新输入！");
            }
        }
    }

    private static void addEmployee() {
        Scanner input = new Scanner(System.in);
        System.out.print("请输入职工姓名：");
        String name = input.nextLine();
        System.out.print("请输入职工工号：");
        String id = input.nextLine();
        System.out.print("请输入职工工资：");
        double salary = input.nextDouble();
        Employee employee = new Employee(name, id, salary);
        employees.add(employee);
        System.out.println("职工信息添加成功！");
    }

    private static void searchEmployee() {
        Scanner input = new Scanner(System.in);
        System.out.print("请输入要查询的职工工号：");
        String id = input.nextLine();
        for (Employee employee : employees) {
            if (employee.getId().equals(id)) {
                System.out.println(employee);
                return;
            }
        }
        System.out.println("未找到该职工的信息！");
    }

    private static void displayEmployees() {
        for (Employee employee : employees) {
            System.out.println(employee);
        }
    }

    private static void editEmployee() {
        Scanner input = new Scanner(System.in);
        System.out.print("请输入要编辑的职工工号：");
        String id = input.nextLine();
        for (Employee employee : employees) {
            if (employee.getId().equals(id)) {
                System.out.print("请输入职工姓名（原姓名：" + employee.getName() + "）：");
                String name = input.nextLine();
                System.out.print("请输入职工工资（原工资：" + employee.getSalary() + "）：");
                double salary = input.nextDouble();
                employee.setName(name);
                employee.setSalary(salary);
                System.out.println("职工信息编辑成功！");
                return;
            }
        }
        System.out.println("未找到该职工的信息！");
    }

    private static void deleteEmployee() {
        Scanner input = new Scanner(System.in);
        System.out.print("请输入要删除的职工工号：");
        String id = input.nextLine();
        for (int i = 0; i < employees.size(); i++) {
            if (employees.get(i).getId().equals(id)) {
                employees.remove(i);
                System.out.println("职工信息删除成功！");
                return;
            }
        }
        System.out.println("未找到该职工的信息！");
    }

    private static void statistics() {
        double totalSalary = 0;
        double maxSalary = Double.MIN_VALUE;
        double minSalary = Double.MAX_VALUE;
        Employee maxEmployee = null;
        Employee minEmployee = null;
        for (Employee employee : employees) {
            totalSalary += employee.getSalary();
            if (employee.getSalary() > maxSalary) {
                maxSalary = employee.getSalary();
                maxEmployee = employee;
            }
            if (employee.getSalary() < minSalary) {
                minSalary = employee.getSalary();
                minEmployee = employee;
            }
        }
        System.out.println("职工总数：" + employees.size());
        System.out.println("职工平均工资：" + (totalSalary / employees.size()));
        System.out.println("最高工资的职工：" + maxEmployee);
        System.out.println("最低工资的职工：" + minEmployee);
    }

    private static void saveToFile() {
        try {
            ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream("employees.dat"));
            out.writeObject(employees);
            out.close();
            System.out.println("职工信息保存成功！");
        } catch (IOException e) {
            System.out.println("保存职工信息失败：" + e);
        }
    }

    private static void readFromFile() {
        try {
            ObjectInputStream in = new ObjectInputStream(new FileInputStream("employees.dat"));
            employees = (ArrayList<Employee>) in.readObject();
            in.close();
            System.out.println("职工信息读取成功！");
        } catch (IOException e) {
            System.out.println("读取职工信息失败：" + e);
        } catch (ClassNotFoundException e) {
            System.out.println("读取职工信息失败：" + e);
        }
    }
}

class Employee implements Serializable {
    private String name;
    private String id;
    private double salary;

    public Employee(String name, String id, double salary) {
        this.name = name;
        this.id = id;
        this.salary = salary;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public double getSalary() {
        return salary;
    }

    public void setSalary(double salary) {
        this.salary = salary;
    }

    @Override
    public String toString() {
        return "姓名：" + name + "，工号：" + id + "，工资：" + salary;
    }
}

在这个程序中，`Employee` 类表示一个职工，包含姓名、工号和工资三个属性。`EmployeeManagementSystem` 类是程序的主体，包含了各种操作职工信息的方法，例如添加、查询、显示、编辑、删除和统计职工信息。职工信息保存在一个 `ArrayList` 中，可以通过保存到文件和从文件读取的方式来实现职工信息的持久化。